Rotary slip



ROTARY SLIP Filed Dec. 18, 1925 2 Sheets-Sheet l E. E F

l0 n d d. l me/nro@ www Fb. 4, 1930. H. R. DECKER 1,745,409

` ROTARY SLIP Filed nec. 18, 1925 2 sheets-sheer 2 gvwenfoz mf# HMM fm1 atroz unf 4 Patented Feb. 4, 1930 PATENT OFFICE HARRY R. DECKER, or HOUSTON, TEXAS, ASSTGNOR TODECXER OIL TOOL COMPANY,

, OE HOUSTON, TEXAS, AA CORPORATION OE TEXAS ROTARY SL12 Application ledDeceI/nberlS, 1923. 'Serial No. 681,336.

This inventionrelates 'to new-and useful lrnrovements 1n a rotary slip.

Y ne object ofthe invention is to provide a slip ofthe character described specially designed yfor the, purpose of holding pipe suspended from a 'rotary in a'well bore. j

Another object oftheinventionV is to provide a sectional slip'whi'ch will readily conform to the shape of, and engage with, the

` `lorpipe to be held.. Y

' yA further feature ofthe invention resides in the provision of a pipe engaging slip having finternal teeth so formed 'that they will readily bite into and securely hold the pipe in the rotary and they outer faces or sidesl of whose jaws will have small frictional contact with the rotary, in which'the slip is seated, so that the' slip can be easily unseated from the rotary. n '4 A stillfuither feature of the invention resides in the provision O f arotary slip which, when engaged with the pipe, will hold the f y.Same against turning in caseit is desired to unscrew or screw togetherjoints of the ypipe above the rotary, thus eliminating the use ofk back up tongs. y f n The slip herein described is very lieXi'ble, of

`simple and light construction, andmay be 'cheaply and easily manufactured, and easily and conveniently handled in use.

With the above and other objects in 'view the invention has'part'icular relation to cer-y tain novelfeatures of construction, operation v and arrangement `of parts, an eXaInple of rwhich is given in this specification and illus-v i trated in the accompanying drawings, wherein f Y Figure l shows a plan view of one form of 4d the slip, partly in section.

Figure 2 shows a vertical sectional view thereof. v Y

Figure 3 shows a side elevation of one section thereof. Figure 4 Shows a vertical sectional view thereof, as slightly modified.

- Figure 5 shows a plan view of another type p of the slip, partly in section. y

thereof.

Figure 6 shows a vertical sectional view "Figure 7 shows a side view of one section thereof; and, Figure 8 shows a vertical sectional view of still another form ofthe slip.

Referring now more particularly to the `upper ends of the respective jaws 2. The upper ends of these bolts are' suitably headed to prevent the detachment of the jaws. In order to prevent the jaws from turning on a vertical axis the upper end of each jaw has a pin 7' which projects 'loosely up into a socket 6 provided in the under side of the bar 3. If de# sired,^the-lower end ofl each jaw may be provided with a transverse notch), and a section of wire rope, as 8, may be fitted into the notches of the jaws of each slip section and secured therein by means of set bolts, as l0, which are forced through the rope, between the strands thereof, and screwed into a tapped hole in the lower end ofthe corresponding jaw, as shown in Figures 1,2 and 4. This prevents the lower ends of the jaws from swing'- ing out of proper alignment.

vIn Figure 4 the anchor bar 3 is provided, around itsun'der side, with a dovetailed groove 11,*and the upper end of each jaw has a dovetailed'projection yl2 adapted to fit into SaidY groove, andfafsety bolt 13 is 'passed through said bar and threaded intoy the upper Aend of each jaw 'to holdthe kjaws against lateral kmovement around the groove l1. In other respects,xthe form shown in Figure 4 is f similar to that shown in Figures l, 2 and.

f In the formfshown in Figures 5, 6 and 7 the bar 14 is somewhat narrower than the bars jaws from turning around on a vertical axis. The lower ends of the jaws 2, in this form have vertical notches 22, and in these notches, of each section, there are fitted loosely arcuate stay bars 23 which are secured in place by the pins 24fwhich are threaded throughthe jaws and whose inner blank end ,projects through aligned holes in said stay bar. This arrange-` ment holds the lower ends of the jaws in arcuate alignment. Y In other respectsthe forni i shown in Figures 5, :6 and is similar to the form shown in Figures 1, 2 and 3. ln Figure 8 there is shown another modication wherein the upper ends of thejfdWs i are provided with notches 17, and the anchor bar 14:V has a depending arcuaterib 16 which is fitted into said notches loosely and the jaws are secured, loosely, to said rib `bythe transverse pins 18 whifchfpass through the` jaws and also passloosel-y through 'said rib.

The lower ends of the'jaws, in this form, arey shouldered in, as at 19 and a surrounding arcuate stay bar 20 is-'fitted into the shouldered in portions of the jaws of each section, and secured te thejjaws by ypins21rwhich are screwed through the stay bar and whose inf- Y In otherrrespects, the form shown inFigure ner ends are blank,` and project through aligned holes inthe lowerends of the jaws.

Seis similar to the lforrn'shown in Figures 1,12 andB.

Each section ofV thel slip; is provided with aV U- shaped vhandle V25 whose lends are Youtwardly turned and rlitted through bear-ings y26 formedin theupwardly extended endsof seme of the studbolts, 4.

VIn all the forms, the inner'edge -of'each jaw is transversely toothedas at'2'7. It is toV be noted that these teeth are straight so lthat ythe'central part of the teeth will first 'co'n-v tact with and bite into the4 pipe, as illustrated in ,Figures 1 and 5.k Thef teeth will thus more readily take holdof the pipe, and further; more, when the pipe is4 thus engaged, allthe kway around the slip will r actas va wrench to hold the pipe against turning in the slip when it is desired to screwfa'joint onto or unscrew it from the upper endv of the pipe. Likewise, the outerl edge of each jaw is straightfthat is,it is parallel to the teeth, or,

in other words,-isjparallel to aline tangential e radial diameter, andthe jaws are fspaceda considera-ble fdistancefapart, thus-` providing a very light, yet strong, construction, and as the ppartsare all loosely' connected together,-

taperi a very 'flexible slip is thus jprovided, which will readily conform to the shape of the pipe,

and engage with it all the way around. It 1s further to be vnoted'that the outer side of each jaw tapers downwardly, relative to the inner toothedface thereof, so-asfto-forma perfect seat `with the downwardly and inwardly g spider of the rotary. What I claim is:

1. A pipe holding 'slip formed of'se'ctions,

each section including a plurality of jaws,

t each Ajaw being relatively thin with respect to its'radial and longitudinal dimensions, meansconnectingsaid vjaws loosely together and-at the same time holding them in spaced relation, saidmeans including vy'vire rope at the lower ends of the jawsand-means for moving each sectionindependenty of: the

other section. I 1

2. A pipe holding slipYformed'of'sections,

each section including a yplurality o-fjaws,v

each jaw being relatively `thin-"with respect toits radialcdimension,.means connecting said jaws loosely together and at-the/ same time holding them in spaced relation," said means including an arcuate bar at' the upper ends of said jaws, the abutting parts fo'feach'jaw and said'bar beingprovidedone with; a recess and the other with aprojection jfitting into said recess and a pin tted through saidproe jectionand also being-fitted into v-a bearing in thel adjacent connected part and 'connecting said parts together. n I

3. A pipe holding slip formed of sections,

each section including a pluralityof jaws, each jaw 'being relatively thin with respect to its radial dimension, means connecting-V the .jaws of a section lloosely together and at the same time holding them in -spaced rela-y tion, said means 'including an; Aarcuate ba'r at the upper ends of said j aws,fthe abutting parts of-each jaw of'a section-andthe corj responding bar being provided one with proj ectionand the vother -witha recess to receive the projection 'and a pin fitted through iro said abutting yparts 'ofthe bar'and of each j jawand connecting said yabutting partsl to# gether. f v f Inv testimony whereof lI have signed my name to thisspecification.

`HARRY n. .nEoKSER l i 

